Thermodynamic evaluation and hydrothermal preparation of KxNa1-xNbO3

稀有金属（英文版）, 2008, 27(4): 371-377.

^1, , ^2, , ^3, , ^4, , ^5,

1.Department of Physical Chemistry,University of Science and Technology Beijing,Beijing 100083,China

2.Department of Physical Chemistry,University of Science and Technology Beijing,Beijing 100083,China

3.Department of Physical Chemistry,University of Science and Technology Beijing,Beijing 100083,China

4.Department of Physical Chemistry,University of Science and Technology Beijing,Beijing 100083,China

5.College of Engineering,Peking University,Beijing 100871,China

基金项目: 国家自然科学基金(50425415;50402022;;50672006)

Thermodynamic evaluation and hydrothermal preparation of KxNa1-xNbO3

ZHANG Ci ^1, , LV Haijun ^2, , GUO Min ^3, , ZHANG Mei ^4, , WANG Xidong ^5,

1.Department of Physical Chemistry,University of Science and Technology Beijing,Beijing 100083,China

2.Department of Physical Chemistry,University of Science and Technology Beijing,Beijing 100083,China

3.Department of Physical Chemistry,University of Science and Technology Beijing,Beijing 100083,China

4.Department of Physical Chemistry,University of Science and Technology Beijing,Beijing 100083,China

5.College of Engineering,Peking University,Beijing 100871,China

Keywords： KNbO3

The Gibbs free energies of reaction △rGr of KNbO3 and NaNbO3 were calculated and then that of KxNa1-xNbO3 was estimated.On the basis of the thermodynamic calculation results,the hydrothermal temperatures were designed at 100,160,and 230℃ respectively.However,NaNbO3 was prepared when the heating temperature was higher than 160℃,and KNbO3 and KxNa1-xNbO3 were obtained at 230℃,suggesting that only at a higher temperature the kinetic requirement is satisfied.According to the X-ray diffraction results,both the solid solutions,NaNbO3-based solid solution,Na1-xKxNbO3,and KNbO3-based solid solution,K1-xNaxNbO3,were hydrothermally synthesized in 6 mol/L alkali (NaOH and KOH) solution at 230℃.

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Thermodynamic evaluation and hydrothermal preparation of KxNa1-xNbO3

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